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image quality.txt
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What mainly controls OD?
MA
What mainly controls Contrast?
kVp
T/F Optic Density (OD) is controlled by kVp?
F, controlled by MAs
Diff b/t light & dark exposure?
Light = underexposed
Dark = overexposed
What % of MA change is necessary to change density?
at least 30%
What to do with MAs if film is underexposed?
double MAs
What to do with MAs if film is overexposed?
half the MAs
What happens to MAs with a 15% increase or decrease in kVp?
15% increase = doubling MAs
15% decrease = halfing MAs
kVp to OD relation
As kVp increases so does OD (And vice-a-versa)
What happens to OD and contrast with a 15% increase in kVp and halfing the MAs?
OD = same
Contrast = decrease
Desired SID (source-image-distance)
21-40 inches
Desired OID
O inches
What happens to image when tube ray is angled?
image magnified
What do you do with a dark film with no contrast?
decrease kVp (increases contrast)
What do you do if the structures appear but they are too dark or light?
adjust MAs
What do you do if the film is light and no structures are seen?
increase kVp
Which has more density, light or dark?
Dark
Optimum kVp?
50-70
MA change w/ obesity, edema, Osteoporosis, 6-12 yrs., infants?
Obesity = 50% increase
Edema = 30% increase
Osteo = decrease 30-50%
6-12 yrs. = reduce 30-50%
infants-6 yrs = 75% decrease
Author
kepling
ID
92278
Card Set
image quality.txt
Description
image quality
Updated
2011-07-08T18:38:50Z
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